From owner-freebsd-stable@freebsd.org Mon Aug 20 15:15:25 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 4A5F11071C69 for ; Mon, 20 Aug 2018 15:15:25 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from hz.grosbein.net (hz.grosbein.net [IPv6:2a01:4f8:d12:604::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hz.grosbein.net", Issuer "hz.grosbein.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id C3957722E3 for ; Mon, 20 Aug 2018 15:15:24 +0000 (UTC) (envelope-from eugen@grosbein.net) Received: from eg.sd.rdtc.ru (eg.sd.rdtc.ru [IPv6:2a03:3100:c:13:0:0:0:5]) by hz.grosbein.net (8.15.2/8.15.2) with ESMTPS id w7KFFGA7052835 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 20 Aug 2018 17:15:17 +0200 (CEST) (envelope-from eugen@grosbein.net) X-Envelope-From: eugen@grosbein.net X-Envelope-To: stb@lassitu.de Received: from [10.58.0.4] ([10.58.0.4]) by eg.sd.rdtc.ru (8.15.2/8.15.2) with ESMTPS id w7KFFDFw076225 (version=TLSv1.2 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT); Mon, 20 Aug 2018 22:15:13 +0700 (+07) (envelope-from eugen@grosbein.net) Subject: Re: Bind to port <1024 in jail To: Stefan Bethke References: <75536186-7D58-498C-BFC6-9284EB7CB444@lassitu.de> <6bfc8608-946d-39eb-cc57-88b3dc3bd7c5@grosbein.net> <89646FDB-F1A9-4070-87EC-22C0CFAFF4E7@lassitu.de> Cc: FreeBSD Stable From: Eugene Grosbein Message-ID: Date: Mon, 20 Aug 2018 22:15:08 +0700 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <89646FDB-F1A9-4070-87EC-22C0CFAFF4E7@lassitu.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.3 required=5.0 tests=BAYES_00,LOCAL_FROM,SPF_PASS autolearn=no autolearn_force=no version=3.4.1 X-Spam-Report: * -0.0 SPF_PASS SPF: sender matches SPF record * -2.3 BAYES_00 BODY: Bayes spam probability is 0 to 1% * [score: 0.0000] * 2.6 LOCAL_FROM From my domains X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on hz.grosbein.net X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Aug 2018 15:15:25 -0000 20.08.2018 22:02, Stefan Bethke wrote: >> The trick is that mac_portacl provides a way to selectively give permission for non-root UID >> to bind low ports: >> >> security.mac.portacl.rules=uid:88:tcp:80,uid:88:tcp:443,uid:53:tcp:53,uid:53:udp:53 >> >> It works just fine for a host and I use it for name servers utilizing port 53 >> for a box with dynamically created interfaces, so it may bind the port for distinct IP addresses >> after it dropped privilegies when new interface is created and get new IP assigned. >> >> I have not tried it for a jails, though. Please try and respond. > > Thanks, but do I understand correctly that the security.mac.portacl.rules are system-wide and not per-jail? It seems so. It is small kernel module and it should not be so hard to make it VNET-aware for one already familiar with the code. You may want to fill a PR for that, so it would became possible to have per-jail settings for VIMAGE-enabled jails.